1. Part 1 If study subject and legal guardians who decide voluntarily to participate the clinical trial, and sign the Informed Consent Form (In the case of study subject less than 7 years of age, written informed consent by study subject's legal guardians), study subjects eligible for participating this trial protocol were assigned to test group and receiving the test drug 1 times or 2 times according to age.

2. Part 2 If study subject and legal guardians who decide voluntarily to participate the clinical trial, and sign the Informed Consent Form(In the case of study subject less than 7 years of age, written informed consent by study subject's legal guardians), the study subjects eligible for participating this trial protocol were assigned to test group or control group with the ratio of 4:1 and receiving the test drug 1 times or 2 times according to age as below;

   • 6 m ~ 3 years
   • 3 years ~ 9 years
   • 9 years ~ 19 years

1. Part 1 If study subject and legal guardians who decide voluntarily to participate the clinical trial, and sign the Informed Consent Form (In the case of study subject less than 7 years of age, written informed consent by study subject's legal guardians), study subjects eligible for participating this trial protocol were assigned to test group and receiving the test drug 1 times or 2 times according to age.

   The safety data collected during part A will be reviewed by DSMB to evaluate the solicited adverse events for 7 days after each vaccination.

   However, if no toxicity higher than grade 3 according to FDA guidance the study was allowed to proceed to Part 2 without DSMB review.

   Efficacy and safety assessment methods, and visiting schedule will be the same as Part 2.

2. Part 2 If study subject and legal guardians who decide voluntarily to participate the clinical trial, and sign the Informed Consent Form(In the case of study subject less than 7 years of age, written informed consent by study subject's legal guardians), the study subjects eligible for participating this trial protocol were assigned to test group or control group with the ratio of 4:1 and receiving the test drug 1 times or 2 times according to age as below;

   • 6 m ~ 3 years
   • 3 years ~ 9 years
   • 9 years ~ 19 years The investigator will evaluate the efficacy and safety of the test product while clinical trial.

Blood samples will be collected at visit 1 for efficacy evaluation. The study subject and their legal guardians will be educated to daily record AEs after vaccination on the patient diary to evaluate the safety.

At visit1, blood samples will be collected from randomized study subjects and investigational drug of doses of 0.25mL or 0.5mL according to age will be intramuscularly injected. However, those who had not been vaccinated with influenza vaccine, aged of over than 6 months to less than 9 years study subjects, will re-visit and have the 2nd vaccination, 4~5 weeks after the 1st vaccination.

After 4~5 weeks since last vaccination, study subjects will visit and blood sample will be collected. And the serious adverse events occurred during 180 days after the final vaccination will be checked through the telephone visit.

The study subjects with 1 dose of vaccine will have 4 visits including Visit 1~2 and Visit 5~6. The study subjects with 2 dose of vaccine will have 6 visits including Visit 1~2, Visit 3~4 and Visit 5~6.

Inclusion Criteria:

1. Healthy infants and adolescents aged 6 month to 19 years
2. study Subject was born at full term pregnancy(37 weeks)
3. study Subject who understand the details of this clinical trial, decide voluntarily to participate the trial, and signed the Informed Consent Form (less than 7 years of age, written informed consent by study subject's legal guardians)

Exclusion Criteria:

1. Those with a history of allergic reaction to eggs or chicken, the vaccine components
2. Those who had been ad ministered the influenza vaccine 6 months prior to the study drug vaccination
3. Those with immunologic impairment including immune deficiency disorders or family history about it.
4. Those with a history of Guillain-Barre syndrome
5. Those with a history of Down's syndrome or cytogenetic disorders
6. Those who would be ineligible to participate the study as follows: serious chronic disease (cardiovascular system disease; excluding controlled hypertension and respiratory system disease; including respiratory failure, metabolic disease, renal dysfunction, hemoglobinopathy, etc)
7. Hemophilia patients at risk of serious bleeding with intramuscular injection or those receiving anticoagulant therapy
8. Those who have active infection or who have fever higher than 38.0℃ within 72 hours prior to the dosing of study drug
9. Those who had been vaccinated with another vaccine within 28 days prior to the dosing of study drug or had a scheduled vaccination during the clinical trial period
10. Those who had received an immunosuppressant, immunity-modifying drug within 3 months prior to the dosing of study drug - (1) Azathioprine, Cyclosporin, Interferon, G-CSF, Tacrolimus, Everolimus, Sirolimus, etc., (2) Those receiving high dose of corticosteroid(15mg/day of prednisolone is acceptable, but study subject used consistently 2mg/kg more than 14days is considered a high dose, so excluded in this clinical trial. However, inhalated, intra nasal and topical administration is acceptable regardless of dose.
11. Those who had received immunoglobulin or a blood-derived product within 3 months prior to the dosing of study drug or is scheduled to receive those products during the study period
12. Those who had taken antipyretic/analgesic/nonsteroidal antiinflammatory drugs within 4 hours prior to the dosing of study drug
13. study Subject who had participated in other clinical trial within 28 days prior to the study vaccination
14. Those whose clinically significant medical or psychiatric condition at the discretion of the investigator that would be ineligible to participate the study