She’s 21 going on 22, so 2 years younger than Bae :)
The ship began when Lydia was welcomed into the YG family and she & Taeyang started hanging out with each other a lot (they’d tweet about it and Lydia even posted that cute video of her, Choice & YB hanging out in the studio). Omg I died when I found out she went on that snowboarding trip with Bae.
And around the same time they started hanging out a lot, I remember Bae tweeted something really cute that implied that he was interested in somebody. You know what it said? The world is you. He also tweeted that a certain song was running through his mind like a week after Lydia posts a cover of the song on youtube.
And I probably wrote more than you wanted, sorry ~ My fangirl heart has a hard time with self control. ^^