Thanks for the chapter!
It's funny how Shin fell for his memories and was unable to kill him. Btw, the numbers Shin was talking about while trying to establish the contract were the values assigned to each side in the contract. Originally she was trying for a 5:5 equal partnership "covenant" contract but MC was too OP for that. Same thing with the 7:3 "Parent and Child" contract. The only thing that worked was 8:2 "control" contract. Not exactly sure what numbers represent other than as number of "votes" each side has in contract. Since MC has 8 has essentially a Master role in the contract while Shin, who only has 2, has a Servant role and can be ordered around. Not sure if MC can order Shin to kill herself or just die on command, but Shin will have to follow any order given that she doesn't feel strongly against.
Btw, side effect to the contract because of MC being more OP than Shin is that Shin will turn into a form similar to his. Not sure if loses any power from transformation or if can return to dragon form or not while contract active but powers and such did get tweaked in a few ways.