EraEpsilon

they had a close up on his brown sachet .. also if you watched the actor long enough you'll know him by his voice and hand XD

I don't understand why did he end up in prison as someone who literally saved the country. I see that the guards are from the imperial army. when cen wei zong came to give him a mission, huai'an asked if the one inside the ritual hall on mount shiluoman is willing to reconcile... who is that person (i thought he means the emperor but idk) and what happened between them... lastly he said once the mission is done the past will be hidden.. what past?
bonus question what's in the bottle cen wei zong gave him?

Guys i need help with the special episode!! I'll leave my question as a reply marked as spoiler

While all other reasons are valid as well but I like to add regarding the story that this will be set in a past time before TBOY and a little after Dashing Youth so SuMuYu should be younger than when he was in TBOY but a little older than Dashing Youth..... In Dashing youth Hou Ming Hou played a young Baili Dong Jun while the actor who played him in TBOY instead played Dong Jun's father. Similar to here, the actor who played Su MuYu in TBOY will be playing Su MuYu's father