This is one of my favourite dramas. There is no second male lead or second female lead here. But there is a second male lead for the second couple because second man was stubborn and the girl was actively pursuing him. The third couple were quite supportive. The male lead is brave in the mission and loves to act cute infront of the female lead. The female lead is also brave in her field and quite talented. You may once think that this drama is too long before watching it but once you start watching the 1st episode you will get engaged to it and wouldn't think that it's long. Overall this drama is really good and a must watch one.