Does adult Hee-do still talk to her old friends in ‘Twenty-Five Twenty-One’ finale? The storyline is built on Hee-do’s present-day daughter, Min-chae, reading her diary from her teenage years.

In the later episodes of "Twenty-Five Twenty-One," we're given glimpses ... up together and consolidated their memories into one photo album. In episode 12, when everyone gathers at Yi-Jin's ...