Ruth: The older twin who's a solemn man who has to disguise as Watit, his younger twin, to find out who tried to kill him. Consequently, Rut and Maytinee's affair befalls under a shadow of Watit.
Watit: Rut's younger twin who's euphemistic and weak because he has a congenital disease. He believes that true love exits and he's willing to do anything for Maytinee, the woman he loves. But unfortunately, he becomes unconscious (in a vegetable state). Therefore, he didn't spend much time with the woman he loves.
Maytinee: A gentle girl who's willing to do anything for her family's sake, even marrying Watit, the man whom she doesn't love. Until she got closer with Rut, the older twin in Watit's disguise, she has good feelings toward him; the feelings she never felt before.
Angkoon: The nephew of his step-father, Wit. He's hot-tempered, envious, ambitious, and pessimistic. He always thinks he's the victim, and that causes a scar in his heart which makes him want to outdo Watit in everything, even in love.
Watit: Rut's younger twin who's euphemistic and weak because he has a congenital disease. He believes that true love exits and he's willing to do anything for Maytinee, the woman he loves. But unfortunately, he becomes unconscious (in a vegetable state). Therefore, he didn't spend much time with the woman he loves.
Maytinee: A gentle girl who's willing to do anything for her family's sake, even marrying Watit, the man whom she doesn't love. Until she got closer with Rut, the older twin in Watit's disguise, she has good feelings toward him; the feelings she never felt before.
Angkoon: The nephew of his step-father, Wit. He's hot-tempered, envious, ambitious, and pessimistic. He always thinks he's the victim, and that causes a scar in his heart which makes him want to outdo Watit in everything, even in love.
This is the second time Yuttana Puangklang and Wannarot Sonthichai are paired up after their first TV-Series End of the String (2013).
Interestingly, in End of the String (2013), it was Wannarot Sonthichai who portrayed twin roles. Then in Shadow of the Heart (2015), Yuttana Puangklang portrays twin roles.