Defiance of the Fall - Chapter 1217: What is Life?

Legend has it that the world’s most formidable man Xu Shuangtze owned a cherished portrait of his deceased wife. But no one knew that on its back was another portrait of his arch rival who Xu Shuangtze had killed with his own hands.

Sixteen years ago, the Chief of Immortal Alliance’s Department of Discipline, Gong Wei, brought a blade with him on the Immortal Ascension Platform. His assassination of Xu Shuangtze failed and he was slain on the spot by the sword named No Way Out.

Sixteen years later, Gong Wei opened his eyes and found himself reborn in the body of a beautiful fool who even had to kneel down when talking to Lord Xu.

This was not the only disturbing thing for him.

Because of his ravishing good looks, remarkable power and status as well as his premature death in his previous life, he was now the beloved muse of countless writers. Books and stories featuring him as the main lead to all kinds of relationships were circulated far and wide. Even among the famous sects there were rumours of his forbidden encounters with every sect leader…

- Description from Novelupdates

Lyle Walt is a young noble boy and heir looking forward to the day he can inherit his family’s territory. Except around when he was 10 year old, his parents started neglecting him more and more in favour of his little sister, Celes.
On his fifteenth birthday, he is challenged to a duel by his sister to see who will inherit the household and horribly loses, being cast out of his family. Afterwards, he gets treated by the family groundskeepers and receives the family heirloom Gem from him that Lyle’s grandfather had entrusted to him. From there, he begins an aimless journey with his childhood friend and former fiancée, Novem, and the Gem-turned-Jewel that houses the memories, personalities, and Skills of seven of his ancestors.

Condition 1: One yellow scarf soldier rune is satisfied

Condition 2: Kill 100 rune monsters independently

Condition 3: 5,000 times of training to kill a pig with a knife is satisfied

Condition 4: 10 Spirit Talisman Pills are satisfied

Rune unlock upgrade.

Your source runes have been promoted from ordinary quality [Yellow Turban Soldiers] to premium quality [Yellow Turban Warriors]!

- Description from novelbuddy

Another entry in what you can call the Proto Harem Series: the books written before the Harem Series that take place in the same world.

It’s about a swordswoman whose student is captured, so she goes to rescue her.