+ craftsmanship
+ drawing (more of a side plot in rbt)
+ enemies to lovers
+ great dynamics of the main couple
+ young people (working life in rbt / college in mao)
+ short dramas (30 minute episodes)
Rainbow Town: 31 episodes / Mountains and Ocean : 24 episodes
+ strong female leads
+ Rainbow Town will not give you a second lead syndrome
In general both dramas are very sweet and have this theme of reviving an old craft which is something that's really nice to see. Rainbow Town also focuses a lot on friendship.