Idk why everyone's celebrating such a massive violation of someone's personal space and the lack of consent. Tongtong kissed her multiple times in her sleep and even tried slipping some tongue in. Imagine if a guy was doing that. I'd bet a lot more people would call it assault instead of saying it's cute.
A) They're children, they're allowed to fuck up.
B) Neither of them are clean here. Lin Xiao Lu's anonymous internet account and pretending to sleep to get kissed are also violations of trust. You could say that makes them both terrible, but, again, children. Allowed to fuck up.
C) It's dumb to get offended on behalf of someone who is not themselves offended. Out of context, yeah, it's not okay to kiss somebody without their permission. In context, Lin really really wanted it to happen (so much that she staged the circumstances) so It is literally a victimless crime. It doesn't make it okay to do, but it does make it easier to forgive.
D) It's fiction. Just because you're excited by a fictional turn of events doesn't mean you have to condone that behavior in real life.