She seems older than them. They all kids pretty young.
Byul got pregnant at 20.
What? Did you mean hyesung?
They've commented on this in this story, actually - I think it's some bullshit about how being a bonded pair keeps them youthful, lol. I remember Byul getting annoyed by it early on or something.
Oh right, hyesung. Sorry it's exam season, students are going crazy
Why does Siwoo's mom have wrinkles and yet Dojin, Hyesung, and Haesoo (even Dojun) all looked the same as they were 15 or so years ago? Is this the power of expensive Korean skincare??