Err basically the manga have many one shot stories compilation

1.first story is about a space ship that try to find new planets to inhabits, the crew gone over 10 million years. The first was 100 years, the crew go cold sleep and wake up in 10000 year later, gone cold sleep and wake up 100000 years later , and gone cold sleep again repeated to 10 millions.

The crew then go insane and suicide one by one. In the end the last crew was an old man who already very old and he managed to find the planets and throw the pods contains human dna and animal dna to that planets so civilization can emerges again.

2.Seconds story was about a man with it's cigaratess, the crew got accident in their space ship, got stranded and in the end they got space virus. The crew got mutated, and become monsters. The last man standing managed to kill the monsters and then he plant some tobbaco plant because he want smoke cigarrates.

In the end the man died but he leaves his man made ciggarates from his tobbaco farm in vending machine. 200 years later the rescue crew come and found it and it say "free ciggarates , take it".

3.Third story was about err a man who have this faith thinking what happens when he died, will he go to heaven and meet angel ? his job was to kill all the alien in the planets using human superior machine. They make mistakes and realized the alien was smart and even took and learn of their weapon. In the end the man was in dilema to use nuclear bomb that can wiped the entire planet with him or run away.

If he run, the alien will learn how to open the portal to human world and start invade. The man then choose to kill all the alien....he then go to after live and meet the alien with angel wings. The dead alien then sentenced his sins by killing over 10 billion alien in the entire planets and the man was so afraid of it. The end.

The last story was from the 2015: Space Series collection from LINE Webtoon. I assume the others are from there as well (but I only read that story).

^thanks a lot dude