In the fourth season of Single’s Inferno, fan-favorite co-stars Lee Si An and Yook Jun Seo (Yuk Jun Seo) picked each other and became a “Final Couple” in the grand finale—leaving viewers hopeful for the relationship to continue off the show. “Single’s Inferno” stars Yook Jun Seo (left) and Lee Si An (right) | @youseeany/Instagram But it…