Semantic error, 2

Jaeyoung Jang... has changed. The one who used to make Sangwoo's life miserable now smiles kindly, puts in a lot of effort for their upcoming presentation, and has generally become quite likeable. And the strangest thing of all, he keeps giving Sangwoo little affectionate touches every now and then! Sure, this improved version of Jaeyoung might be much nicer, but how is Sangwoo supposed to treat him when he seems to be causing him strange problems?