2gether

Tine is a handsome student and cheerleader in college, while Sarawat is one of the most popular guys on campus and a leading light in the soccer and music clubs. When Tine is chased by Green, whose feelings he does not reciprocate, he ends up begging Sarawat to pretend to be dating him in order to chase Green away.
Gradually, in a story as old as time, pretence begins to turn into reality. However, before there can be a "happily ever after," there must be the process of falling in love, and the dawning realization that they aren't pretending anymore. Somehow, they do not want to.
(Source: Soju at MyDramaList)