Virtues of Hamony goof!

In episode 31-32 Deno Cheung appears as the fiance or boyfriend of a girl with a birthmark on her face. They were engaged, and left to another place.

Then, in episode 222 (i think..) he returns again as the fiance of Bondy Chui's arch enemy. They meet and shake hands, as if they have never seen eachother before. Perhaps the directors forgot? Its like none of the people there have talked to him before!