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본 건

what (someone) saw

→ 보다
phrase Rare #23,914
what (someone) saw 건 is a contraction of 것은, meaning “thing” plus a topic marker. The person who saw it is understood from context.
KO: 네가 본 건 꿈이 아니야.
EN: What you saw wasn’t a dream.

지금 본 건 잊는 게 좋을 거 야

You'd better forget what you just saw.

— 멀홀랜드 드라이브 (2001)

비리디언에서 우리가 본 건 끔찍했어.

What we saw in Viridian was horrible.