Looking for a manhwa~~

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!