So: drama.
The Big Damn Kiss from Qiu Tong was chapters 145-146.
The Latent Love Triangle with Mo Xiaonan reached its peak with no resolution in 149 (150 was the Christmas special) with the Origin of the Crush on Sun Jing flashback in 151.
Then it’s all Cute Flirting, Sun Jing the Dork, and Tales of Tattletale one-shots until 170, at which point the School Trip was announced. Mo Xiaonan brings Tattletale’s lost stuff to the classroom and glares at Sun Jing in 168.
So the drama could theoretically be picked up any time, or it could never be anything except little side bits with Mo Xiaonan ever again.
If it’s a choice between a More Spurned Would-Be Lover with No Identifiable Character Traits dramatic arc and QT Pretends to Be Tsundere one-shots for the indefinite future, I know where my vote goes.