Answer and Explanation:
1. The character who faces the conflict is Mike, who is the protagonist of the story and the narrator of the story, that is, we know all of this according to Mike's eyes and his view of what is happening.
2. Mike faces an internal conflict that is related to the very thoughts he has and the feelings he feels about the conflict he is experiencing.
3. Mike went to visit his grandmother at the nursing home and she mistook him for her ex-husband and started asking him for forgiveness for the things she did in the past. Mike pretends that he is actually the grandmother's husband, but faces a big problem, as he feels extremely guilty for cheating on her like that, but he doesn't have the courage to show her that he is not who she thinks.
4. The character solves this problem by going home and removing what caused him to be confused with his grandmother's old husband, the mustache. With that, the character shows that he is leaving this story behind and will not think about it anymore.