in depth or? I think you should read it spoiler-free. But I can tell you a little.
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(I might remember things wrong, just a disclaimer)
They both fuck multiple times, then mc gets pregnant. There's this whole thing going on with his asshole of a dad who hates omegas and already has a doubt about ml being involved with mc. So to protect ml and his brothers, he breaks things off with ml and agrees to marry a dominant omega friend of his while trying to find a way out. But ml catches on that something is wrong pretty quick. They talk it out pretty soon and make plans to throw mc's dad's life upside down by leveraging his obsession with mc.
The main couple is cute af. They always communicate well, are very obsessed with each other. Compared to all the other accidentally got knocked up manhwas, this one was the healthiest relationship.

Guys, i read the novel. You're in for a treat ;p