Spoiler
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In regards to body type in the beginning chaps of the novel Cale's body was described to be on the fit side because OG!Cale cared about his appearance so much so that Kim Rok Soo/Transmigtator!Cale described OG!Cale's body to compliment every clothes he wears cuz he has a good body lel so I think this one is an accurate representation of it. He later gets skinnier as the story progresses because of of his continuous use of Ancient Powers and not exercising too much and eating less
Its actually quite a sad reason why OG!Cale started acting like trash
Spoiler (I think?)
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KRS speculated that the possible reason why OG!Cale started acting like trash was because he wanted to protect Violan (his stepmother) and Basen and Lily from the Henituse Clan. The clan wasnt favorable to Violan marrying Deruth because she came from a commoner family. So to protect them OG!Cale started acting like trash to raise the favorability of Basen being the better heir to the county as opposed to Cale. Which will also raise Violan's favorability because she's the mother of Basen. This is also the reason why Violan and Deruth didn't hate OG!Cale despite his trashy behavior because they knew why he was doing this
the author isn't paying enough attention to the details. choi han's design is kinda horrible, and cale is supposed to be on the thinner side, with brownish red eyes instead of gray. I hope they draw cale thinner in the future tho (spoiler: it's integral to the story).