@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.