I think they did a good job of continuing the story from Sweet Home Season 2 and keeping it interesting with the questions of the neo humans, Lee Eun Hyuk reappearing, the origin and possibility of destroying all the neo humans, and the genetically created infected people including the girl with the tentacles, the rock guy, and liquid metal guy. There was some tear jerkers with the Wang Ho Sang turning, Yi Kyung dying in the tunnel trying to save her daughter, and the little boy turning into slime. I'm kinda glad that they included the slime boy even if he didn't do much for the story. I guess it is stuck to the webtoon story as I don't remember the little slime boy doing much of anything besides guiding somebody somewhere and I think the mom recognized him like they did in the drama.

Now are the things that they just mentioned and hinted at, but didn't give a conclusion too. First off is Dr. Lim and the infected monsters he created and the vial that was in their stomach. That was just mentioned towards the end of season 3 and I don't think he explicitly said how they worked and even what they were composed of. Sergeant In Hwan mentioned that it was Sang Wook's blood, but I don't think Dr. Lim said that and he was just saying that to stall him when the crow platoon was sneaking residents out. Dr. Lim took the vial out of Ja Yeong, girl that could sprout hundred of arms out of her back, but it didn't seem to affect her when it was taken out, but she already was hinting at her pain before that.

One other big plot hole and I thought it was going to make a big impact in the last fight was Chief Ji's son that transformed and was hanging from the ceiling. It maybe was a cocoon, but it seemed that it ate people in that form and it was also hinted at neohumans being drawn towards it. The neohumans were killed outside of the entrance by Sang Wook on a whim and he hinted at them being drawn to something after being reborn, so I thought Chief Ji's son was going to come into play later. Tak In Hwan also mentioned they were going to eliminate her son, but they never followed up on that and Chief Ji was so hung up over it and I don't even think she made an appearance after that talk about her son and her suicide attempt.

Biggest plot point and one that the Sang Wook was worried about was the source of the neohumans, because they were immortal in comparison to Sang Wook. They mentioned this in like 6th episode when Hyun Soo and Eun Hyuk were in the church after they met up. They talked about it like they were going to stop all future neohumans by destroying the source, which I thought was going to turn out to somehow be Chief Ji's son, but I guess they didn't have enough budget to finish that plot point.

Kim Young Hoo the rouge soldier that was sent out to the lab in season 2, I didn't care much at all for his plot line as it felt like it was just used as a bridge to help bring together Eun Hyuk and Hyun Soo and Eun Yoo. One other character that I didn't care at all for was Father Peter and Sun Hwa, the one person who stayed behind while others was evacuating, as they didn't have much character development. It seemed like they were hinting at a relationship, then it randomly shows a flashback of her briefly showing monsterization symptoms, but it felt like those two where an after thought when it came to the plot.

One thing that I thought they did well was the internal conflict that was often brought up in the original webtoon and I liked how they portrayed that in the drama like when Hyun Soo initially brought Yi Kyung back from monsterization and when he was fighting within himself between his true self and monsterized self.

I felt like they made Yi Su so much weaker then she could've been, because she summoned the giant buff monster to show off to Sang Wook. If she could do that, then couldn't she have an entire army of over powered monsters at her hand, instead of just turning residents and making them pretty much just meat shields with no attack ability.

I felt like they were just killing of people to make for tearjerker moments, but the way they were going about it didn't have that much impact for me. The only death that impacted me was Yi Kyung, but even then I felt like I couldn't dwell in the death, because it immediately moved onto the next scene where Yi Su was being dragged off. Eun Yoo showing signs of monsterization all of a sudden and then going off on her own felt like they didn't know how to end her story line, so they just choose something easy that wouldn't affect the main plot. Yi Su's character absolutely killed the acting, as her acting was on point when it came to the crucial scenes. I think her character stood out most for me, as her character was most congruent throughout the story and made sense.

Lastly I think it was fine to end it how they did regarding the rooftop scene to pay homage back to the beginning of their encounters with each other. The neohumans coexisting with humans was so rushed and did not make much sense for how the plot was being setup before with them possibly destroying the source of the neohumans. That point felt hashed together to put a cap on what they would do regarding the neohumans.