So I was reading this one somewhere but broke my phone so remembering where it was is pretty hard. The MC is a modern dude who wakes up as the third son of the emperor on his wedding night. His wife forces him to eat vegetarian food. He then proceeds to do time traveler things. Opens a restaurant. Makes stronger alcohol. He saves his new brother using his medicine that somehow came back with him and he draws hyperrealistic drawings. He tries to But his wife calls him out on his bs when he obviously tries to plagiarise poetry which hasn't been written yet. I found that refreshing. He also has a friend who is a kleptomaniac. He engineers his sister's divorce from this dude who would end up neglecting her until she died and and engineers the revival of the song military so that western xia and Liang take them more seriously.
Never read this before, but I'd like to ask if you remember what language it was, and if this was translated? Also is this just Transmigration, or is it World Hopping? Does it have a System, or is it Cultivation (or both)? Anyways here are some guesses based on the tags you provided: https://www.novelupdates.com/series/living-leisurely-in-tang-dynasty/ https://www.novelupdates.com/series/zhui-xu/ https://www.novelupdates.com/series/rule-the-roost-in-the-tang-dynasty/ None of these have to do with the Song Dynasty but anyways it's China and it has a dynasty so
Found the book recently. It was MTLed so it was no wonder I forgot what it was called. It's called: 北宋闲王 or Xianwang of Northern Song Dynasty. But I haven't read a lot of the books recommended here. So hanks everyone.