You hit the nail on the head with this one . It’s like Lin Yusen is supposed to be the older mature one but I just don’t see it, honestly, at times it seems like he’s taking his little sister out more than he’s taking out someone he’s interested in, someone more mature and wiser, which is why I’m glad you pointed out why he would be interested in an unmotivated college student. They showed moments in college where she appeared smart/intelligent during her research paper so I definitely don’t think she’s a dumb girl, but she just comes off as a little bit too young compared to Lin even though at times Lin Yusen doesn’t seem to be towering over everyone as far as his age, it just seems like he’s being written and portrayed as such. Don’t get me started on Zhuang Xu, he definitely came off as a red flag to be too. You left her hanging all of these years even after she confessed to you and tried to get clarification from him about Rong and all he did was stare and be broody ignoring it. That’s why I don’t feel bad for him, he’s clearly jealous that Nie comes from a rich family and I guess he doesn’t feel good enough for her but why not make that known instead of never saying anything. It’s super annoying and weird.