@Person well actually that di** sejin saw was ido's shi*** brother. That day ido told shi*** brother to go ido's home bcs he had present there..well it was something else actually but sejin was there bcs heat. So that shi*** brother thought sejin was a present. So he grape sejin...so sejin remembering his past life. And ido actually regress. So he tried to amend his past mistake. Sejin commit su*c*de by shot his own head in front of ido using that gun..thats why ido panicked.
@Savita GC basically, the di** was mls brother who basically graped mc in the original timeline, which made ml think mc was cheating on him, making mc shoot himself with the gun which wasnt locked away in the original timespan