Sang-hyo faces the biggest challenge of her job when her next client turns out to be architect Gu Hae-young (Jin Yi-han), her ex-husband.

Meanwhile, Sang-hyo has caught the eye of her boss Jo Sung-gyeom (Namkoong Min), a strict but thoughtful hotel managing director who has all the female employees swooning.

[3] But there's also ambitious public relations manager Yeo Eun-joo (Lee Young-eun), who competes with Sang-hyo for both a promotion and Sung-gyeom's heart.

Sung-gyeom may be connected to the case, while Eun-joo attempts to use the circumstances surrounding the murder to get a leg up on the corporate ladder.

As Sang-hyo and Hae-young juggle their sudden reunion under awkward circumstances, the exes also get sucked into the murder investigation.