K-drama midseason recap: On the Verge of Insanity – character-driven workplace story blossoms into thrilling drama

• Grounded in reality and all the better for it, this series finds drama at every turn in the goings-on at rural engineering office of a home appliances maker
• There’s a villain, of course, and a resourceful woman with divided loyalties, both ably backed by a supporting cast that make the show thoroughly relatable