Taeyeon is offered as a sacrifice to the water god, Jiyong. Instead of killing her, like she presumes he will, he takes her in as his bride. (partially based off of the Bride of the Water God and Suijen no Ikenie)     

Death has followed Taeyeon her whole life and she thinks the only way to repent is to spend the rest of her life serving God. Jiyong is an outside factor that she doesn’t expect to get in her

"If there was one thing we agreed on, it was this: we wanted to see our world burn." -- a chaebol AU with multiple pairings.    

Sooyoung gets pregnant, and Taeyeon is somehow sent to salvage the situation by getting put on We Got Married a second time, with none other than G-Dragon, of all people. It's not, by far, SM's best idea for damage control.