Haengseong Ingan

After an asteroid destroys Earth, Moon You unintentionally becomes the last person in existence, or so he thinks. Stuck on a research facility on the moon, he struggles with being the last person alive. Little does he know that humankind is watching his every move from Earth.
(Source: WEBTOONS)

One day, an unknown egg appeared in the neighborhood. The egg spreads rapidly, and the monster that emerged from it began to kill people. And there was an SNS account where all these situations were relayed in real-time.
 
(Source: Naver, translated)

Planetary Doctors: The ability of a model planetary human made to imitate a planet spreads to the world and becomes a disease, and people who suffer from the disease. And the people who wanted to be planetary people and the people who didn't want to be planetary people. All beings modeled after planetary humans are called 'planetary'. Hwangji and his party try to solve and rectify the 'planetary' that arises due to them, but the world moves as if it were set and does not stop.
 
(Source: Naver, translated)

Note: Chapter count includes a Prologue

Humanity is suffering from the worst drought in history, but it isn’t because there is no water. No, there is plenty of water. But we are no longer in charge. When the tide comes in, the fish come in. When the tide goes back out, the fish go back out, taking us with them inside. When our territory clashes with theirs, which species will prevail?(Source: WEBTOONS)