There is a lot of quality difference between the two. Kwon Soon is a young guy and developing to break into the top 100 rankings but Khachanov’s big hitting will be too hard to handle.
I see a lot of value at Khachanov winning in straight sets @ 2.25 but will go with the safe option here which can accommodate a set victory by Kwon Soon.
Khachanov has a lot of ability and I feel he can win the US Open someday at least. Grasscourt isn’t his best suit, but he is good enough for the first few rounds. He reached the QFs in the French Open. He played well at Halle and Stuttgart. He has been playing well at the Boodles Challenge, beating Tsitsipas.
He should be having a decent run in Wimbledon. Slim slim chances he will be broken in the match. Kwon Soon can serve well, but not for straight 6 games and will be broken once each set.
Should be an easy win for Khachanov with glimpses of what is to come from the future from Kwon Soon.
Tvmoca propose : Under 37.5 Games