ZheXu and MiJin Instagram accounts
https://www.instagram.com/adrian.xxuu?igsh=MXRqbTJudWd0dGUzMA==
https://www.instagram.com/mijin_0416?igsh=MmVnMXZ4OG10NTNy

Kill to Love in Instagram and YouTube (vblogs)
https://www.instagram.com/killtolove_video?igsh=MThidmd2M3l5amhwYg==
https://youtu.be/1nsMTgdC5Ow?si=cUMNJbFuzZhJSoa1

National Drama League - official YouTube channel for episodes
https://youtu.be/P12OjrBkjtw?si=bM32G-EGUtdXiAei

The Weibo account for the doctor, Li Yixian is

@李一想爱吃夺夺粉's personal homepage - Weibo 

A more comprehensive cast list - so difficult to find information:
Main / principal cast
Zhang Zhe Xu (张哲旭 / Zhang Zhe Xu) — Duan Ziang.
Mi Jin (弭金 / Mi Jin) — Xiao Shuhe.
Wang Ding (王鼎 / Wang Ding) — Huo Ying.
Cheng Fang (程方 / Cheng Fang) — Xiao Shuqian.
Yang Shu Wei (杨书伟 / Yang Shuwei) — Duan Huaiyi.
Li Yi Xiang (李一想 / Li Yixiang) — Shen Song.
Supporting / additional credited roles (from cast lists, trailers and listings)
Da Tao (大涛?) / Luo Gu Yuan — credited in some full-credits listings.
Shu Wei Yang — appears credited as Duan Huai Yi (supporting episodes).
Young / flashback actors credited in listings: Yichen Chen (young Duan Ziang), Keyu Wang (young Xiao Shuhe).
Wei Long Xu — credited as Emperor of Ji Bei (appears in episode credits).
with the Chinese characters you can find them easily in Weibo, Douyin and RedNote and then use the translator.