Minjeong has a crush and brazenly confesses to Jimin on her graduation day. To Jimin, recalling her days at high school, Minjeong was like a shot of espresso, and for the first few days and weeks of studying at university, Jimin couldn’t stop thinking about Minjeong.

Or,

Jimin and Minjeong are dating, and they're trying their best to hide the relationship from her five unnies.