Moon You

 was a Sci-fi Webtoon Original created by Cho Seok; it concluded on June 4, 2019. The original Korean Webtoon premiered on Naver and concluded on August 30, 2017.

Synopsis
''After an asteroid destroys Earth, Moon Yoo 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.''

Moon Yoo
Moon Yoo is a bio-zoologist dedicated to a life of mediocrity, believing that staying in the middle would be the best way to live his life, ironically this mentality leads to him being sent to the moon and getting stranded on it. After being left on the moon by accident, he witnesses as 1/11th of an asteroid manages to hit Earth, rising the sea levels and ending with all human life.

Related

 * The Sound of Your Heart: Same creator