Responses
After they sleep together, they don't really get together. Then at the perfume collaboration event, ido doesn't show up. Sejin find him standing in front of his car. Long story short, as Sejin starts to walk away, ido begs him to not go. Then proceeds to sob for hours.
They decide to start dating. Then the novel switches to idols point of view. Starting from beginning of first life to second life. Then it ends with them taking about Marraige.
This is much condensed version.

Look im all over regret and shit but god if i need more groveling.