I Built A Lifespan Club is a Manga/Manhwa/Manhua in english language, Manhua series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

Chen Li works at Mo city, he works there every day with no hope to be seen for the future… until one night. Chen Li obtains a special ability, an ability to buy “Time” and “Lifespan” from people, sell “Time” and “Lifespan” and also let things speed up “Time leap” and slow down “exhaustion time”. So he begins to build a top-class “Lifespan club”!