Spoiler

He was raped twice, once by that bastard, and once by his own husband.
When he found out he was pregnant, he didn’t even know whose child it was as the gap between the rapes is too short.
In the end, he shot himself with that always-loaded gun Ido kept mentioning, right in front of Kwon Ido, without a shred of hesitation.
He died along with the child he carried.
That’s why, in the second timeline, Ido refuses to have a child with him, he feels he doesn’t deserve to be a father.