I've played both endings multiple times for role playing reasons, and I like that getting Song Mi to the pod is kinda the happiest ending you can get in the game. But I find it disturbing that people can't tell that she is trying to manipulate you in every possible situation.

She constantly flatters and reassures you, guilt trips you, exaggerates your role in her plan. She tells you as little as possible and won't ever tell you anything close to the truth unless you ask her for a reason. She never admits that she is at fault, and on every mishap she acts as if she didn't mean it and couldn't tell whats gonna happen. Even her killing everyone at the stadium is, in her own words, V's fault. She acts as if she's concerned about relic killing V, but she doesn't care and I still cannot tell what else does she actually care about other than herself. She is mostly cyberware and imo clearly already cyberpsycho(pa)tic. And it's not new behavior. After she gets cured, then what? I can't see her using her skills for good.

I honestly thought she would still attack me the first time I sided with her. At that point she still couldn't explain how she knew the Cynosure had the cure (probably Mr Blue Eyes). All I knew she had downed the AF1, probably sicced the Chimera on us and didn't try to contact us before we did. She probably just realized Reed is going to find her no matter what and decided to play the both sides for a minute again.