How to complete the mission for Bai Jin to join the team in Sword风云决, and how to increase favorability with Bai Jin in Sword风云决 Note: "Sword风云决" seems to be a direct translation of the game's name, which might not be its official English title. If there's an official English name for the game, it would be best to use that instead.

In "The Decisive Sword", getting Bai Jin to join your team requires completing a series of tasks and increasing favorability. The specific steps for Bai Jin to join the team in The Decisive Sword are as follows. Trigger the plot and battle. After completing the mission "Rescue from the Wild Wind Fort", talk to Bai Jin in Luo Village, and the player triggers a battle. Defeating Bai Jin can increase favorability to 10. If defeated, favorability can still be increased through other means later, but it will cost more resources.

Carry out the Wanzi Mountain mission: After the battle, choose "Choose this plan", go to Wanzi Mountain, kill 5 bandits, then return to Luo Village to report the mission, choose "Tell him". At this point, Bai Jin's favorability can rise to 40.

Defeat the Tianlong Gang leader: Go to Wanzi Mountain again, defeat the Tianlong Gang leader in the plot, and obtain the Tianlong Heart Method and Twin Dragon Slash. Then you can choose between a Grade 7 hidden weapon Yinhua Piao, a Grade 7 accessory Dragon Pattern Pendant, or 3000 yuan to give to Wei Huo. Bai Jin's favorability can rise to 40 again (if the previous battle in Luo Village was not won, this is an opportunity to make up for the favorability).

Complete the "Jin She Qing Mei" mission: Go to Luoying Forest, talk to Bai Jin, then go to Tan City, purchase 5 jars of plum wine, return to Luoying Forest, present the items, trigger the plot, choose "Trust Bai Jin", which requires a battle. After winning, you can get the martial art Drunken Eight Immortals Staff (dropped randomly). After the conversation ends, Bai Jin's favorability rises to 55, and you can also win the martial art One Arrow Two Preys.

Gift and invite to join: Give Bai Jin 2 Golden Wound Medicines to boost favorability to 60, and then you can invite her to join your team.

In summary, all the plots for Bai Jin to join the team in The Decisive Sword require continuing with the "Broken Sky and Extreme Scenery" and "Scenery Beyond the Frontier" missions. Completing the "Broken Sky and Extreme Scenery" mission can earn the martial art Sand Shadow; the "Scenery Beyond the Frontier" mission needs to be triggered when Bai Jin's favorability reaches 80 and the plot progress is at "Mainline - Aftermath of War" (if the favorability reached 80 earlier, advance the task progress to "Mainline - Famous Sword Visiting the Sick", starting after leaving Wudang). Completing the mission automatically earns the martial art Heavenly Net Nails.