mangaupdates, LINE Webtoon.

Synopsis:
A special side story commemorating the dramatization of <See You in My 19th Life>. For Seoha, who has become helpless after his mother leaves, Joowon takes Seoha to the countryside where his mother often goes. What will you see and who will you meet there?

Note:
Had to separate from the main series because it has its own mangaupdates page. But, as a bonus, I uploaded another series.