Where is their other child...?

Lena? They mentioned she already has a fiance- maybe she's with him now or she even got married Ik she's still a child, but considering how these 6 year olds are about to get engaged, that's highly probable. Maybe lena will appear for a short while, lile a cameo, but i think this season's focus are on the twins lol. I can't complain, I love this manhwa so much