This is a first-in-human, two-part, Phase 1 study that will characterize the safety, tolerability, PK, and immunogenicity of HuL001.

This is a first-in-human, two-part, Phase 1 study that will characterize the safety, tolerability, PK, and immunogenicity of HuL001 after single ascending doses in healthy subjects followed by multiple doses in IPF subjects. The study will be conducted in 2 parts:

• Part A will enroll 3 single ascending doses (SAD) cohorts in healthy subjects. (HuL001:Placebo=4:2)
• Part B will enroll 1 multiple-dose cohort in IPF subjects. The proposed dose of HuL001 will be selected from the single-dose range of HuL001 evaluated in the healthy subjects of Part A. (HuL001=6)

Inclusion Criteria:

Subjects who meet the following criteria will be eligible to participate in the study:

Healthy and IPF Subjects

1. Female subjects and male subjects with female partners of child-bearing potential must agree to use adequate contraception (2 forms of birth control, one of which must be a barrier method). This criterion must be followed from the time of the first dose of treatment.
2. Able to understand, sign the written informed consent form, and follow the study procedures.
3. With no clinically significant abnormalities in vital signs, 12-lead ECG, and clinical laboratory assessments at screening as judged by the Investigator
4. Corrected QT interval using Fridericia's (QTcF) < 450 milliseconds (msec).

Healthy Subjects only

1. Aged between 20 and 55 years of age inclusive, at the time of signing the informed consent.
2. Alanine aminotransferase (ALT), alkaline phosphatase (ALP), and bilirubin ≤ 1.5x upper limit of normal (ULN) (isolated bilirubin > 1.5xULN is acceptable if bilirubin is fractionated and direct bilirubin < 35%).
3. Body weight ≥ 50 kilogram (kg), < 75 kg and body mass index (BMI) within the range 19.0 - 29.9 kg/m2 (inclusive).

IPF Subjects only

1. Aged between 40 and 90 years of age inclusive, at the time of signing the informed consent.
2. FVC≥ 40% and DLCO≥30%
3. Alanine aminotransferase (ALT), alkaline phosphatase (ALP), and bilirubin ≤ 2x upper limit of normal (ULN) (isolated bilirubin > 2xULN is acceptable if bilirubin is fractionated and direct bilirubin < 35%).
4. Diagnosis of IPF as defined by ATS/ERS/JRS/ALAT guidelines (Raghu 2018) within the past 7 years prior to study participation.
5. Patients who are ineffective with an approved therapy (i.e., pirfenidone or nintedanib), or who are judged by the Investigator to be unsuitable for receiving approved therapy

Exclusion Criteria:

Subjects presenting with any of the following criteria will be excluded from participating in the study:

Healthy and IPF Subjects

1. Female subjects who are breastfeeding, pregnant, or planning to become pregnant during the study period.
2. The Investigator considers that the subject is not in the condition to participate in this study.
3. Evidence or history of clinically significant (as judged by the Investigator) hematologic, renal, endocrine, pulmonary (except for IPF subjects), gastrointestinal, cardiovascular (except for IPF subjects), hepatic, psychiatric, immunologic, metabolic, urologic, dermatologic, neurologic or allergic diseases, or other significant clinical findings within 3 months prior to screening.
4. Has participated in a clinical trial and has received an investigational product (IP) within 60 days prior to screening.
5. Previous history of anaphylaxis and severe allergic reaction, generation of neutralizing antibodies, or hypersensitivity to albumin or a protein-based therapeutic, or any other monoclonal antibody.
6. Had blood donation within 60 days or had blood donation over 250 mL within 90 days prior to screening, or cannot commit to stopping blood donation during the study period.
7. Receipt of vaccination within 1 month of screening or plan to receive vaccination during the study.
8. Have significant active infection (acute or chronic) within 28 days prior to screening.

Healthy Subjects only

1. A positive test for Human Immunodeficiency Virus (HIV) antibody, Hepatitis B surface antigen, or Hepatitis C antibody result within 3 months of screening.

2. Abnormal baseline blood tests exceeding any of the limits defined below:

   • ALT or aspartate transaminase (AST) > 1.5x ULN, ALP and bilirubin > 1.5x ULN (isolated bilirubin > 1.5x ULN is acceptable if bilirubin is fractionated and direct bilirubin < 35%)
   • Total white blood cell count < 2,500/mm3; subjects with lymphocyte count less than the Lower Limit of Normal (LLN) may be included at the Investigator's discretion; platelet count < 95,000/mm3
   • Creatinine > 2x ULN, calculated creatinine clearance < 60 mL/min (per Cockcroft & Gault)
   • International Normalized Ratio (INR) larger than upper limit of the normal reference range (0.9 - 1.3)

3. Current chronic history of liver disease, or known hepatic or biliary abnormalities (with the exception of Gilbert's syndrome or asymptomatic gallstones).

4. Unable to refrain from the use of prescription or non-prescription drugs, including vitamins, herbal and dietary supplements (including St John's Wort) within 14 days or 5 half-lives (whichever is longer) prior to screening, unless in the opinion of the Investigator the medication will not interfere with the study procedures or compromise subject safety.

5. Previous exposure to any chimeric, humanized, or human monoclonal antibody, whether licensed or investigational.

6. Using tobacco products, nicotine products (patches, gum etc.) within 6 months prior to screening.

IPF Subjects only

1. A positive test for Human Immunodeficiency Virus (HIV) antibody, or Hepatitis C antibody result within 3 months of screening.

2. Abnormal baseline blood tests exceeding any of the limits defined below:

   • ALT or aspartate transaminase (AST) > 2x ULN, ALP and bilirubin > 2x ULN (isolated bilirubin > 2x ULN is acceptable if bilirubin is fractionated and direct bilirubin < 35%)
   • Total white blood cell count < 2,500/mm3; subjects with lymphocyte count less than the Lower Limit of Normal (LLN) may be included at the Investigator's discretion; platelet count < 95,000/mm3
   • Creatinine > 2x ULN, calculated creatinine clearance < 60 mL/min (per Cockcroft & Gault)
   • International Normalized Ratio (INR) larger than upper limit of the normal reference range (0.9 - 1.3)

3. Interstitial lung disease other than IPF.

4. Medical conditions, e.g., recent MI/stroke, severe chronic heart failure, pulmonary hypertension, or cancers, unsuitable for the study in the opinion of Investigator.

5. Acute IPF exacerbation during Screening.

6. Relevant airways obstruction (pre-bronchodilator FEV1/FVC< 0.7).

7. History of allergic or anaphylactic reaction to human, humanized, chimeric or murine monoclonal antibodies.

8. Treatment with prescription drugs for IPF within 5 half-lives of the drug, whichever is longer, prior to dosing.

9. Major surgery (major according to the investigator's assessment) planned during the course of the trial. (Being on a transplant list is allowed).