the MC not only could be patient in his revenge, his revenge also is a heavy hammer to his opponent. I am itching and irritated when he didn't immediately end his opponents, which I also admire his patience

The MC is a thirsty power bottom who has chosen a partner in the wrong genre. The marshal is an alien within his culture as a pedantic and strict monogamist who is very willing to use promises of potential s*x to lure the poor thirsty MC (who shouts that this deprivation of only getting to look and not eat is abuse) into agreeing to marriage. The marshals assistant figured out early on that the MC has significant scum potential as someone unwilling to consider marriage. Part of the reason for this difference may be that is the ML’s first relationship but not the MC’s. However, the MC is not max level hypocritical scum. He does commit to his relationship with the marshal and does not consider other partners. It is pretty clear that his reluctance to confirm a long term commitment is more out of long established cynicism than unwillingness. He likes the marshal, but how far can they really go and, more importantly, how long can their relationship last in a culture that is so preferential to alphas in matters of relationships? The MC does not concede to being the weaker party in a potential marriage, but he acknowledges the ugly reality that the longevity of their relationship would rely entirely on his alpha partner’s initiative. The society he finds himself in and its laws have no protection for him. He claims eventually in a very self deceiving inner monologue that he has the confidence to put down the relationship and divorce if his partner (within his legal rights) takes a concubine, but could cutting off a relationship of potentially decades or even centuries really be so easy?