There's this girl; she's in some kind of lecture. A fight had started, between an undercover agent and an enemy. They were fighting for a while. But there's something special about this girl. The enemy schemed a tremendous attack on the undercover agent, but the girl instantly reacted and somehow got in front of the agent to dodge the attack. As she dodged the attack, the enemy quickly got away, but the girl was lying on the floor about to vanish. She's half-human. Her eyes were closed. All she could feel was a fatal pain, not being able to move and hardly breathing. The agent panicked, calling her name and shaking her body to wake her up. She was starting to vanish. She opened her eyes, looking at the agent, telling him her last words "raise her well" with a miserable expression as she vanished away into the air. He didn't get to say anything to her, as he was sorrowful. He was regretting everything.
He never anticipated that his spouse would die in front of him in such an unfortunate way. He was holding back tears, as a female colleague showed up and had his 4-year-old daughter with her. His daughter came running towards him, saying «dad~!». She hadn't seen him since the day before, as he was busy with a mission. She missed him; she attacked him with a big hug. He hugged her back tight, holding back tears. He was holding back his tears until he got the question «where's mom?». He burst out crying, not saying anything.
They were about to leave the area. His colleague and his daughter had already gone outside, waiting for him to come. As he was about to leave, he slightly turned around looking at where his spouse died. Her wedding ring was on the floor. He noticed it and picked it up, as a tear fell down his cheek. He regained some of his memories with her. He left the area while crying. There's no turning back.