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The true "affair" here is emotional rather than physical. The male lead’s ex-girlfriend (a world-class ballerina) tries to rekindle their romance while he is married to the female lead. Simultaneously, the female lead’s first love (a dashing painter) returns, creating a four-way emotional labyrinth. If you love the tension of an affair without the actual adultery, this is for you.
While technically aired in late 2013 and early 2014, "A Wife’s Credentials" (JTBC) deserves a spot on any "love affair" list for 2014. This drama is quieter, more psychological, and devastatingly real.
The 2014 Korean drama you are looking for is titled Secret Love Affair