Badarn Jai 1993 (Thailand), also known as Badaan Jai, The Nether Mind is Thailand drama premiere on 1993 on Channel 3
Sakkarn mentally falls apart because the plane his fiancee was in crashed a couple days before their wedding. Devastated, he went crazy and couldn't accept her death. From there on, Sakkarn wouldn't work, and likes to be alone in the dark. When he does come out, he would wear his dark sunglasses. He then asked to move to his beach house where he and his fiancee shared lots of sweet memories. He isolates himself from the world.
His parents and sister didn't know what to do so Sakkarn's mom asked advice from a longtime friend who has a daughter named Purimarn. After Purimarn heard about what had happen to Sakkarn, she felt sorry for him. Purimarn and her mom decided to pay a visit at Sakkarn's beach house, per his mom's request.
At the beach house, Purimarn was swimming and began to drown. Sakkarn saw that and couldn't stand watching so he rushed to help and gave her a mouth to mouth. When the elders saw that, they were happy because he was not crazy after all and aware of his surroundings. The moms now had a plan and that was to get Sakkarn and Purimarn together. They think that she can help him become his normal self again and wake him up from the past. Purimarn agreed as she wanted to help. Sakkarn agreed as he doesn't want the elders to mess with him anymore. But Purimarn was not aware of what she had gotten herself into...
(Source: Written by MyDramaList)