@JenL Very good points. There are certainly elements of tragedy-comedy in the show, and they were totally right about the ajummas being a greek chorus. However, unlike a greek chorus that provides insight into the characters, it seems the ladies were always wrong.
If the writer truly meant to kill Jun, I can't make sense of it. She left too many hints about a reunion. First, there is harabeoji and Sunja's story (you'll meet again if it's fated to be), Dr. Cha's movie quote ( If you love something set it free. If it comes back it's yours.), Jun saying he might suddenly disappear and asking RaRa to hold on, and finally RaRa's quote (if you endure through the hard times, you can reap the benefits). I think the writer wrote herself into a corner with all the twists. She wanted to subvert tropes and stereotypes, but I think she wanted to execute one big twist with Jun being alive, but didn't know how to execute it properly.