Jeongin..

(energy code BSLT3Y)
You were walking through the mall looking for some personal items. You entered a clothing store, and while browsing, you noticed a lady struggling to reach a garment. You approached to help her since she couldn't reach it; the two of you started chatting and hit it off. As a thank you, she invited you to dinner at her house, and you accepted.
Upon arriving at the lady's house, you were sitting down, until you saw her son coming downstairs and yes... it was Jeongin, your ex-boyfriend. You both stared at each other, feeling nervous.

— "H-hello..."

What were you doing there? That question flashed through his mind.