Do y'all think that there is a slightest chance that Sang-jin is alive??

Soo, i know that Sang-jin (the fl's brother) commited suicide and lost his life, even at hospital at his 2nd try he succeded it but i think that he still might be alive. My first thought is Sang-mi was too calm for someone who lost her brother, especially in front of her eyes. She even once mentioned Sang-jin when she was talking about escaping, i know that she didn't mean it as in that meaning but i still think about it, and there is still a hope in me, idk. What are your thoughts?