Starting to get the feeling that Semin has some sort of mental illness due to trauma and is trying to live through Yohan. It's why he stalks him, because he idealizes Yohan's life.
Yohan, I think is picking up on Semin's behavior and is finding it cute.
But the thing is, I don't think Semin can stop doing this which is why I'm starting to consider this a form of self-medication of untreated mental issues. It's like he has become an addict and there has to be a reason for that, a trigger.
this is going to be a spoiler so, you might wanna skip reading my comment till the end. I've completed reading this in comica, I honestly didn't enjoy most of the story but I still really like this manhwa lmao. The cringe is REAL thoo.
I forgot if this has been covered in anywhere from the latest chapter in here but Semin is prescribed with anti-depressant pills (? i kinda forgot) well he had depression. And it came back when he met Johan, he became so self-hating, thinking he is not good enough and Johan is like the perfect guy in his eyes so that's why he's copying him. If I remember correctly, Johan knew from the start that Semin is copying him but he let it go cause he like Semin (or he knew starting from the middle, I honestly forgot, but he knew). I might say some hit and miss cause I kind of forgot the whole deal with these two, it's been a while since I've completed this series lmao
But Semin is a freaking stalker. I'm afraid he will keep going and it would get creepy... (I doubt it though). i hope John really likes him. . . or maybe there's another side to him.