From Webtoon Live:

From runeis, the creator of Cactus and Radio: Gyu Min is a regular college student and a regular customer at cafe Alice, a coffee shop run by his female sunbae. He's enjoying her company but he's giving up his studies, even his girlfriend, to wait for this "March's Rabbit." During the year he takes, watch as the story unveils what waiting for "March's Rabbit" is all about, and how Gyu Min finds himself along the way.

Naver's page description:
"This was supposed to be a Christmas special but became a New Year's special instead ^^;; I'm uploading late because of various issues but please understand my circumstances and enjoy the series~ I'll begin 'Cha Gi Jak' as a Challenge toon again. Those interested, please favourite me! I'll start January~" -runeis

Original Webtoon