28, Cheongchun!

Na-Ra returns to university as a senior at age 28 after taking a long leave of absence for personal reasons.
At this time in her life, when she’s grappling with many existential questions, her first love from her school days, Do-Hyepn,
and Han-Ju, the younger brother of her ex-boyfriend, burst into her life and keep making things even more complicated...

(Source: Naver, translated)