2-jugan Jaewojuseyo

One sweltering day, university student Kim Ki-Beom comes home to find Su-Hyeon, a runaway high school girl in front of his house. Trying to be a responsible adult, Ki-Beom attempts to send Su-Hyeon on her way. After discovering she may be hiding a painful past not unlike his own, the softhearted Ki-Beom agrees to let her stay. But there’s a catch: she must leave in exactly two weeks. The clock ticking, Ki-Beom gets to know Su-Hyeon - only to realize that there might be more to his unwelcome houseguest than what meets the eye…

(Source: Lezhin US, edited)

Note: Chapter count includes a 10-chapter side story