Responses
No, they aren't the same person. But I think Old Xian and Tan Jiu are friends :)
Read Mosspaca Advertising Department. They work together in this manga and you can see the difference between their art style :)
No, they're friends/coworkers
Are Tan Jiu and Old Xian the same person? Their art style is so similar (づ￣ ³￣)づ