Song of Dog and Bird

Ji-Han, a doctor who specializes in treating patients, meets a new patient, Lee Hyun, who is full of problems. Their first meeting was not so good, but as they continue to receive mysterious treatments, the two become closer. Ji-Han gives Lee Hyun, who longs to go out, a drug that is still under development, and Lee Hyun, who sneaks out in the middle of the night, gets caught by a mysterious person...

(Source: Bomtoon, translated)

Note: Part of Bomtoon's Kkulman Danpyeonseon (꿀맛 단편선) Collection.