
Why won't the mom just let them tell yansheng that niannian was the one who saved him??? Let's make him suffer more plis.

Uhm... Here's some Spoilers?
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It was actually NianNian who begged the mom not to say it (and the mom promised NianNian so ╮( ̄▽ ̄)╭). NianNian wanted to keep it a secret from Yansheng, because he wanted Yansheng to truly fall in love with him. He doesn't want to use Yansheng's guilt as a bargaining chip to return his feelings. (In contrast of what the fake savior is doing, which is taking advantage of Yansheng's gratitude and guilt).
Ahhh I'm soo confused!! Who do I want more, sangjae or that high powered blender???? What. A. Tough. Choice.