Superstar From Age 0 - Vol. 1 Ch. 21

[MangaDex]

 

[EchoGirl]

LOL i'm surprised he wouldn't have an ability to 'heal' his grandma, tho i guess it's not the focus (although convenient if he does make everyone healthy and live longer and more youthful energy or so)

haha i bet seo jun could make a whole story book/monster encyclopedia based on all the creatures he's been/met in his past lives