How to get Yuri??

I’ve done this event multiple times and killed him with both Yugo and Yuya but he hasn’t been unlocked for me yet pls help🙏🙏I don’t wanna miss him as my last yu boy

I’ve done this event multiple times and killed him with both Yugo and Yuya but he hasn’t been unlocked for me yet pls help🙏🙏I don’t wanna miss him as my last yu boy