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SPOILERS!!
Actually they did not.The ending for the novel is not known.In the chapter you're showing us they did not go back together.They just officially ended their relationship in a peaceful manner.So there could be closure.Anyway the ex will later find out that his lover knew that yoon was in coma but didnt bother to tell him so he got super angry.And at the same time the ex wife will come back.
The two seme will basically fight for yoon

The uke will chose his ex and thats the endgame