For those considering a transition from engineer to manager, I will share my experiences as a new manager leading a mixed team from both LINE and Yahoo Japan Corporation. I will discuss the differences between the roles of an engineer and a manager, the mindset required for managers, and provide concrete examples from daily operations to convey the significance and appeal of this transition. Additionally, I will touch upon how to understand and absorb the cultural differences between LINE and Yahoo Japan Corporation, sharing insights on effectively unifying a multicultural team.