There's an useful guide on Steam about this card game, since it appears on Gujian 3 (a very good game imo).
I'll pass you the link:
Visual Guide for the Derived Game "Lost Tales": From Relationship to Combos [All Cards Translated] (steamcommunity.com)
All credits goes for CarlZ, the user who made this amazing guide. Also, be aware that the english translations may not be the same in SOLO, but definitely this will help you to understand what's going on
That is amazing! Thank you!