Huanxi yuanjia is a Chinese idiom for a pair who quarrel constantly yet are bound to each other. The literal translation is 'happy enemies'. In romance dramas it is the enemies-to-lovers pattern: the two squabble in nearly every scene while becoming each other's support. The playful arguments are the show's main source of comedy. First Love Again is described this way, a campus story that pairs a basketball court with a literature department.
Where it comes up

Neon & Nine-to-Five
First Love Again: The Campus Romance Opening on Three Platforms in Two Days
A guide to the 24-episode campus romance-comedy First Love Again as it airs on Tencent Video, iQIYI and Mango TV: a basketball captain, a student with stage fright, and the second pairing of Huang Cancan and Zhou Dawei.