While Qianjie spent a pleasant period recuperating at the sanatorium, he learned the language of this era under Aponia's guidance. Qianjie was actually very intelligent; he merely had a violent temper.
However, most of his temper was directed at Aponia. He was fairly friendly toward the children.
The reason for his irritability was that Aponia pulled far too many absurd stunts, enough to make even him feel his blood pressure spike.
For instance, to celebrate Qianjie's arrival, she made a cake. Then, apart from herself and Qianjie, every child ended up sprawled across the floor.
Qianjie was instantly dumbfounded, while Aponia said she seemed to have used salt instead of sugar when making the cake. Qianjie went completely numb on the spot.
They could only call emergency services and send the children to have their stomachs pumped. Later, analysis of the food residue recovered by the doctors revealed that the salt in those cake remnants was not ordinary salt, but nitrite...
In other words, Aponia had somehow used nitrite as sugar to make a cake. Fortunately, the children had their stomachs pumped in time and barely survived.
When Qianjie learned the truth, he was truly speechless toward Aponia. If she had not cared for the unconscious children without sleep or rest, he would genuinely have suspected that Aponia was trying to kill him.
Fortunately, Qianjie's body was tough enough that he could still be full of life after eating those special nitrite cakes. Aponia herself had eaten very little, giving most of it to the children, so she only felt somewhat unwell and recovered quickly.
From then on, Qianjie banned Aponia from entering the kitchen!
Thus, Qianjie began his evolutionary journey toward becoming Master Chiyou. At the sanatorium, he served as a mason, welder, carpenter, cook, tailor, plumber, locksmith, pianist,