I know this is sad but the expression LiHuan does after YuYang gives him that face looool ...

Yes, he's usually extremely stoic resulting in an almost expressionless face so Lihuan must be pretty upset to make such an unfamilar face! Guess it's the first time he has actually been shown to be visually emotive and it's all ovet due to being ignored over a stupid understanding ( which hopefully won't take multiple chapters to be resolved).