Summary taken from Lezhin US, which uses Korean names instead of original Chinese names:

Im Jiun, a freshman, moves into a share house to have his own space, hoping for an average-looking roommate. But his new roommate, Jeong Suhyeon, is not only handsome and kind but also from a chaebol family—so rich that he owns the very share house Im Jiun is living in. As time passes, Im Jiun realizes that beneath Suhyeon’s sweet exterior lies an unpredictable side, and before he knows it, Suhyeon kisses him out of the blue! How will Jiun handle this chaos?

Original Webtoon:
R15: LINE Webtoon
R19: LINE Webtoon

Official Translations:
R15: Thai
R19: English, Thai