Characters - 

Aiden Liu

- the youngest of the two. become the only child after his elder brother died

- since that, his mom pampered him and it adds another nickname for him, which is "mommy's boy"

- genius, but the laid back type 

- targetting to be as ordinary as possible 

- dork, timid and hopeless romantic

Krystal Jung

- the youngest of the two, princess at heart but didn't really show it

- independent & hardworking

- always been compared to her elder sister, Jessica

- ambitionist

- love romantic things, deep inside her heart.. but didn't show it