Transmigrated to the 60s as the Female Supporting Character's Best Friend

'''Both the main story and extra chapters are complete. Upcoming works: "Trash Transmigrated into Cannon Fodder [Quick Transmigration]", "Transmigrated into a Sixties Childless Widow", "Starting a Food Business in the Nineties" Yu Xiao, a 21st-century college junior, transmigrated into the role of the best friend of a reborn villainess in the late 1960s. Though the villainess was malicious, she treated her best friend exceptionally well. Unwilling to get caught in the conflict between the transmigrated female lead and the reborn villainess, Yu Xiao—bound by a deal with the original host—had no choice but to work hard to restore the villainess's intelligence. When Yu Xiao transmigrated, th...