The purpose of the study is to evaluate the experimental medication WD-890 compared to placebo in participants with moderate-to-severe plaque psoriasis.

Inclusion Criteria:

• Male or female participant aged 18 to 75 years(inclusive)at the time of informed consent.
• Diagnosis of plaque psoriasis for at least 6 months prior to the screening visit.
• Body surface area (BSA) ≥10%, Psoriasis Area and Severity Index (PASI) score ≥12 and static Physician's Global Assessment (sPGA) ≥3 at screening visit and randomization

Exclusion Criteria:

• Participant has a nonplaque form of psoriasis (for example, erythrodermic, guttate, inverse, pustular,or drug induced psoriasis.)
• Has uncontrolled arterial hypertension characterized by a systolic blood pressure (BP) ≥160 mm Hg or diastolic BP ≥100 mm Hg Note: Determined by 2 consecutive elevated readings. If an initial BP reading exceeds this limit, the BP may be repeated once after the subject has rested sitting for ≥10 minutes. If the repeat value is less than the criterion limits, the second value may be accepted
• Class III or IV congestive heart failure by New York Heart Association Criteria