I think a lot of summaries get the premise right but miss the core tension. Sure, it's about a modern military doctor, Xia Qingwan, dying and waking up in the body of a spoiled, bullied rich girl named Gu Qing during a military training camp.
But the real plot isn't just her using special forces skills to dominate boot camp. It's the meticulous, almost paranoid long game she plays. She's not just getting fit; she's surgically dismantling the social and familial traps set for the original Gu Qing, while carefully laying a foundation to eventually return to her own life's mission. The boot camp is merely the first, most controlled battlefield. The main drive is watching her balance immediate survival in a hostile 'family' with the long-term goal of getting back to the front lines, all while the male lead, a mysterious high-ranking officer, begins to suspect this cadet is far more than she seems.
It's that slow-burn reveal of her true identity that hooked me, more than the military action.