Controversial drama with disappointing ending

This drama has stellar cast and production quality is superb, but the plot and message behind it are very controversial, to say the least.

The first 4 episodes were a solid 9, though heavy-handed, insensitive religious patronizing can be clearly seen from the very beginning. But after episode 5 it rapidly went downhill. Episode 6 was like those countless crime dramas about exaggerated corruption and untouchable chaebols with over the top acting and resolutions. Very meh.
And the last two episodes were drilling on the same message - suicide is a selfish act, it's not about you, you should keep on suffering for the sake of others. The only insightful part was about a suicidal salary man, who basically started the chain of events that lead ML to his own suicide - it showed ML the ugly reality of that dream he so desperately wanted to have, the one the government and society kept on brainwashing him to strive for since he went to school. But they never delved anywhere further with that. Instead of guilt shaming ML with his mother for the whole episode they should have explored what ML really wanted in life, how can he be true to himself like he said he wanted to. Is being a cog in an uncaring corporate machine what people really should strive for in life? Just such a waste of potential here narrative wise.

But as it is, this drama didn't try looking into the cause, didn't try to resolve any of the problems SK's society has that leads people to commit a staggering amount of suicides every year, like poverty and unemployment, it just tried to guilt shame suiciders through religious and societal dogmas. Makes one think that it was sponsored by SK's government, who seems to be impotent in solving this serious country wide issue and now just resorts to such cheap shots like this drama. Maybe it will work better on Asian audience with their traditionally communal mentality, but it's a very hard sell for individualistic West.

The suicide topic here is viewed from such narrow perspective, it really started to piss me off by the end. No exploration of mental health state of suicidal people or various circumstances that lead to this hard decision. Yeah, in ML's case perhaps he was too rash in attempting suicide since he had a caring mother and a girlfriend (though seeing how lonely he was with his problems at the beginning, these people have shown him lack of moral support when he really needed it, and his mother was later shown hoarding money for him, which she should have given him years ago to help cover his education debts he was paying off for many years). But what about people who have no such people in their lives? What about terminally ill/severely crippled/mentally unwell people who see themselves as burden to their relatives and society? What about kids being beaten by their own drunkard parents and nobody cares? What about people who are living in miserable poverty with no hope for a better future? They should also keep on suffering for the sake of others and their country or go to hell? So many unique lives with unique problems, but this drama had no compassion or desire to explore any of that. It's like that cartoon meme: Nope, stop talking, go to hell.

As for the ending, well, ML got a second chance in life and that's a win (?). But consequently it also invalidated everything ML did in other people’s bodies and all those who were supposed to die will die, including his girlfriend, and all the bad guys, including two serial killer psychos, will still be walking scott free.
So all in all, this drama just left me kinda perplexed as to how to score it, because, on the one hand, the quality and cast were superb, but controversial message and disappointing ending made me feel like I've wasted my time watching this.
I guess I'll score episodes 1-5 with 8.5 and 6-8 with 7.0.