When Uncle Mai had sex with a girl with a child for the first time, he was interrupted by the little boy, and then his mother went to coax the little boy. There is a shot in the back where Uncle Mai lifts the quilt and takes a look at his little brother. I think this is a hint.
Therefore, Uncle Mai was able to avoid the sniper rifle when he had sex with the woman at home. He should be suspicious when he understood that his aspect did not match the woman's strong reaction. Otherwise, it's a bit too difficult to hide.
Hahaha If this is the case, it would be interesting.
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