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So when Ruo will have to take care of his monster restaurant his mom actually got Yanchuan to be the cook in her place and that's when both of them start to explore their feelings in a save environment and get to know each other for real now. And then they end up happily in a relationship.
The open ending actually feels like a happy ending instead of a Tragik one. Even more so with how much Ruo indulges Yanchuan when he Acts in love with him right qt the end.