My Neighbor Nari

Reclusive geek Woochan, who yearns for tranquility after suffering the consequences from his brother's past with loan sharks, encounters a sweet but determined force: Nari, the daughter of the loan shark company's CEO. Love-struck, Nari persistently tries to seduce him, eventually moving in next door, but Woochan repeatedly rejects her advances, clinging to his desire for peace. However, as Nari's charm chips away at his defenses, Woochan finds himself sucked into the allure of this unexpected connection, which sparks a series of events that will rock his quiet life forever... whether he likes it or not!

(Source: Tappytoon)