레인 드롭

Han Kang, who has just been discharged from the military, meets a naked stranger, Kang Rae-In, at his older sister's house that he visited after a long time. Han Kang, who mistakes the adult Kang Rae-In for a high school student with nowhere to go, takes pity on him and invites him into his room, and the two suddenly start living together... (Source: Mr.Blue, translated)