Dwayne Johnson may be ‘the Rock’ on the outside, but the 47-year-old definitely has a gentle and sweet heart. The actor often sends love and wishes to his fans, particularly when they are in need.

Johnson caught wind of Hyrum Harris, a 3-year-old boy suffering from leukemia, who happens to be a “Moana” superfan, particularly because he loves Johnson’s character, Maui.

On Instagram, he has posted a video clip of himself singing “You’re Welcome” on Monday from the film “Moana” and dedicated it to the little boy.

“This message is for a little boy out there, he’s 3 years old, and this little boy is one of the coolest little boys around, and he’s certainly one of the strongest because he is a fighter,” Johnson says in the video. “Right now, this little boy is in the fight of his life.”

Dwayne Johnson (L) singing “You’re Welcome” from Moana to a sick 3-year-old boy (R) will surely melt your heart. (Dwayne Johnson/Instagram)

The Jumanji actor goes on to speak directly to the boy. He says, “I heard that you love a movie called “Moana,” which is crazy, because I love that movie too.”

He further added “And I also heard that you watch “Moana” almost 10 times a day because the character you love, Maui, gives you strength.” Johnson had lent his voice to the character Maui in the film.

“According to Hyrum’s mama, his most important thing to say now is, I STRONG,” Johnson wrote in the caption of the post.

He went to say, “Yes you are big man. Yes you are. Hyrum, I know I’m a complete stranger to you – who sounds a lot like your hero, MAUI (only with a very large head), but myself along with millions of other strangers who will watch this video are sending you so much love, strength, and mana your way. I STRONG. Love, the Rock aka the dude who sounds a lot like Maui.”

Shortly after, Johnson posted another message with a response from little Hyrum. Hyrum has a heart melting wide smile on his face on receiving the message from his favorite Maui himself. Johnson wrote in the caption, “Look at this lil’ boy, Hyrum’s face. That’s some joy real right there.”

“He looked at me,” Harris’s mother April said. “Smiled so big. Sang ‘You’re Welcome’ right along with the video. It was touching. Hyrum’s smile is infectious [and] healing to those that serve him and love him.”

GoFundMe for Hyrum is available for anyone who wants to donate and alleviate the family’s medical expenses.