Rakuin no Monshou - Volume 4, Chapter 1: Dark Clouds over Apta

A con-man and policewoman that are legends of their respective professions suddenly die, then are reincarnated and return to the Tang Dynasty of ancient China as little kids.

Accepting their second chance and forced restart, they choose to use the modern knowledge and specific talents that they have in their previous lives in order to live comfortably in this new life.

- Description from Novelupdates

The future unfolded on a magnificent scale into the Interstellar Age. Humanity finally solved the space warp technology, but when humanity transported themselves into the other end, they discovered that place neither had a past nor future, nor was there any land under the starry skies……

The mysterious sanctuary was actually a world filled with countless tyrannical unusual organisms. Humanity faced their great leap in evolution, starting the most glorious and resplendant new era under the starry skies.

“Slaughtered the God Blood organism ‘Black Beetle’. Received the God Blood Black Beetle’s Beast Soul. Used the God Blood Black Beetle’s flesh. Randomly obtaining 0 to 10 points of God Gene(s).”

- Description from novelupdates

Kim Taejune, wanted to be a “hero,” a “savior” to all the weak. After reading books about them, he too wanted to be one. Yet he lacked power, he didn't have any skills, and the command system everyone else had but one day, his dream will come true. His path leads him to encounter Yoon Harin a woman who after the death of her twin younger brother Yoon Jiho was transmigrated into his novel, “Calamity Hunter” the “god” of this world makes a deal with Yoon Harin to bring her brother back to life IF she can survive as a savior till the end.

To treat her sick brother, she was forced to marry him in place of her cousin, who was disfigured and paralyzed. At first, their relationship was purely transactional, with neither caring much for the other. But after going through a lot together, they fell in love with each other. He doted on her deeply.She was considered an ordinary person by the world, but it was later discovered that she had multiple identities - a mysterious underground boxing champion, a highly-skilled doctor, and a mysterious and renowned composer... He also realized that their fates had been intertwined long before they met.