“I can breathe again.”

These were the first words 15-year-old Trevor Sullivan of Detroit, Michigan, uttered to his parents when he woke up after a heart transplant he underwent last November 13, 2015, ABC News reported.

Trevor, who was diagnosed with severe cardiomyopathy in February 2015, underwent surgery after eight months of waiting for a heart donor.

The video of him waking up after his surgery made its rounds around the internet and became viral after his father, Philip, shared it on Gift of Life Michigan on Facebook, a nonprofit organization that promotes organ and tissue donation. According to the Daily Mail, the teenager asked his mother Kimberly to record the first moments after the anesthesia wore off after his operation.

“I think it’s really cool and I wish everyone in the world can see it because it really makes a difference,” Trevor told ABC News about the video. “It promotes organ donation and people can see the outcome of it and how happy they really are.”

In the 42-second video that has been viewed over 1 million times as of writing, Trevor tells his parents: “I’m so happy. I’ve been waiting so long. I can breathe again and talk.”

He assures his fine state when he tells his father, “I feel amazing. I’ve never felt so good.”

Trevor said in an interview that he “feel[s] fine after recovery” and “can do anything now.” He added that he “feel[s] really relieved.”

His mother was jubilant when he saw him recovering . “It felt like it was better than the day he was born,” she said.

Trevor’s father said his son had been been “feeling sick” for over a year before he was diagnosed early last year.

“We just chalked it up to ‘We don’t know whats going on,” he said in an interview with ABC. “In September 2014, he was on the football field and said he didn’t feel good…we thought it was allergies.”

It definitely wasn’t allergies because on right around the time he was diagnosed, Trevor was airlifted from a nearby hospital to the  C.S. Mott Children’s Hospital because of sudden heart failure.

A GoFundMe page dedicated to riasing funds for Trevor’s care, says he was put in the transplant register a few weeks after he was discharged.

The family knows little about the donor, just that it is from a young person who had good muscle tissue and a ‘strong heart.’

Whoever the donor may be, Philip expresses his gratitude. “Thank you for saving my kid.”