I'm sure that this will be resolved quickly, but I don't think it's fair to say that Mo is just there for drama. I understand that it is a common trope. But Tan Jiu has shown a lot of care for SQ's side characters and I think that's what this is. There have always been lots of girls at Sun Jing's school who strongly admire her.
Mo is one who felt a bit stronger than the rest. We saw that throughout the series. But she never confessed and now she has Qui Tong and knows that there was a chance (I say this as Sun Jing could have been romantically interested) but now there isn't because Sun Jing found someone.
Naturally, she now feels a little hopeless and wants to maybe at least explicitly tell Sun Jing how she feels. Given what we know about Sun Jing, it won't lead anywhere, but it is important for Mo to stop hiding how she feels.
TL;DR: Mo confessing is for herself, no one else.
last edited at Dec 25, 2017 4:49PM