The Girl Downstairs(2019)

Lee Du-Na!

When Won-Jun moves into a new apartment for his first day in college, he was not expecting an ex celebrity, Du-Na, to be living downstairs, hiding from her past life. Won-Jun finds Du-Na strange and avoids her at first, but soon finds himself in her room without realizing what he is getting himself into.

(Source: WEBTOON, edited)

Note: Includes 18 extra chapters.