Petal27's Questions (2)

I'm looking for a bl manhwa. It's the one about that one guy who doesn't process emotions like others do and the mc is older than him its in side stories right now and there was an amnesia arc cause mc got into a motorcycle accident...pls help~~

I was reading it but I totally forgot the title and it's been forever.
It's a bl manhwa and it's about gambling? The ml has a nickname: 'the Tzar' and the mc is blonde and a cutie. The ml took him into his gang to work for him cause mc is good at listening where a card lands in a shuffle (he used to be a piano player). Where I left off, they were living togeth2r and had kissed ( -_・)? They are planning a revenge on the ml's dad(?)

Please help me find it~~ ty!