The Great Idle Person of the Zhenguan Era.

Summary

Cheng Chumeng was beaten by his father due to his poor usage of goods sold by Li Su. He initially wanted to hit Li Su, but after some thought, realized it wasn't reasonable to blame him for his own mistakes. However, he still needed to vent his anger and Li Su suggested he hit a nearby silver apricot tree instead. After exhausting himself, Cheng Chumeng left, saying he'd come find Li Su again next time he's unhappy. Li Su then began working on a three-dimensional grid, creating a model for something, but didn't reveal what it was. Dongyang Princess appeared, curious about what Li Su was doing, and he explained the concept of a model, but didn't disclose what he was planning to create.

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