Lol, YES I have an entire theory about that, already predicted in my head! (≧∀≦) Scroll down if you want to know.
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I have a feeling maybe the ex's new boyfriend used to date the mc's current boss and that's what the boss' ring means, and maybe if mc's current boss had anything to do with the mc getting chosen to go to that war zone five years ago... and the new boyfriend knew that, then that could be why he ditched the boss and approached the mc's ex to "give comfort"... (⊙…⊙ )
Never mind, someone's just spoiled the entire story... *eyeroll*
HAHAHAHA. Yup. I was late on seeing that tho. Thanks anyway (づ￣ ³￣)づ
What was that thing that the new bf doesn't want to tell Taejungggg?? Fishy.