Quick Transmigration: Roses Bloom Among the Thorns

[Secret identities] + [Childhood sweethearts] + [Mutual devotion] [Quirky, tsundere ice queen of a big sister × strong yet tragic, seemingly gentle but secretly calculating little brother] One day, after Mu Yaoqing had grown accustomed to working on comeback missions, she was transferred to the character-development division... System: “Those few poor souls in the character-development division have no one to look after them. The great Main God thinks you’re so capable, Host, that he’s assigned you to the division for an internal training test. You won’t refuse, will you?” Mu Yaoqing: “Do I look like I can refuse?” And so... Mu Yaoqing: “I’ve gotten used to the comeback division. I only want to focus on my career and don’t want to bother with that weakling. What should I do?” System: “Host, look on the bright side. What’s the purpose of our missions? Of course, it’s to help our targets reach the pinnacle of life. Why can they reach the pinnacle? Because you pave the way for them behind the scenes. And how do you pave the way? By building your career in secret. And why do we build our careers? Of course, to win over our targets. So building your career is the same as doing your mission.” Mu Yaoqing: “...” After that, things became impossible to turn back... Ancient setting Mu Yaoqing: “I paved the whole road for him. All he had to do was take the throne, and he just handed it to someone else??” Modern setting Mu Yaoqing: “My little darling worked so hard, and all he wanted was to catch up with his idol. And in the end, that idol was me???” Cultivation setting Mu Yaoqing: “I taught him everything I’d learned in my life, and all he wants is to become my Dao companion???” [The setting is fictional. The protagonist has sound values and isn’t mindlessly foolish! Enjoy!]