Sparks fly when an ambitious rules-bound lawyer clashes with a maverick new hire who threatens his chances of partnership—and the walls he's built around his heart.

When Kriya follows her boss and joins a new law firm, she’s looking for a fresh start after a messy break-up. Sharing an office with her work nemesis was not what she had in mind.

Charles has always played by the rules, and had clear boundaries until Kriya crashed into his space. A few too many unfortunate professional encounters has him convinced this attractive girl can’t stand him, and things only get more awkward as they are forced to work so closely together . . .

But just as they’re figuring out how to navigate this frenemy relationship, Kriya needs Charles’ help: pretend they’re dating so her boss will stop hitting on her. As they have to keep up the facade in front of those closest to them, it soon becomes less clear whether they're enemies, friends – or something else.

Award-winning author Zen Cho delivers a sparkling and witty rivals-to-lovers romance. Behind Frenemy Lines is reminiscent of Sally Thorn's The Hating Game and Sajni Patel's The Trouble with Hating You.