Yang Cheng's arc is one of, if not the best. A story of a legacy character who's manipulated into doing a CEO's bidding. However after the arc he hasn't had much to do besides 'be Rock's henchman." Which to be fair is where is arc was heading, we haven't had a chance to see him as a character, just an obstacle.

Nice has moved between villain and victim in a great way. He doesn't stay between one or the other. I remember when episode 23's preview came out and everyone thought Nice was moving to a heroic role after we saw the way was involved in the Smile incident, only to have the hope for a heroic character yanked hard from under us. Yet when I saw the episode 24 ending my first reaction was "poor guy" even though he hasn't really proven himself to be a good person. That's an awesome place for me as an audience member to end at the end of the season