They'll separete, no contact at all. I've read the novel and to be honest I'm really happy, because their relationship is as healthy as ever. They understand each other so much, it's so beautiful. There is some angst when they stop talking, but nothing that they can't deal with. The ML is so mature, and it makes him the most attractive EVER. He is also very in love with WonWon, and we will have his POV of their love story soon!(≧∀≦)
I've read at 여우코믹스 website, https://fxfx316.com/list?toon=72234

Spoiler
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I found this manhwa just yesterday and more two chapters and it's the season's end ( T﹏T ). Also, they'll be 8 years without contact, since WonWon's custody goes to his mother, they'll be 28 years old.