Recently discovered these animated bonus stories that take place after or outside the main Blood of Youth story. Spoilers for the main story because of this, obviously. 

少年歌行番外篇之桃花烙 (Extras: Peach Blossom Brand)

少年歌行番外篇之少年事 (Extras: Stories from Youth) - spoilers for Dashing Youth

Unfortunately they're not English subbed on Youtube because the channel doesn't allow fan-submitted subs. I'm willing to hard sub & upload them myself if there's enough interest (mainly the Peach Blossom ones) if no one else has yet.