The first sign of the winter season is usually the chilly weather that sends you running for the space heater, coats, hats, and sweaters. Then, there's Christmas presents, shopping, and decorations.

Ultimately however, the Christmas season doesn't start until the first Christmas song floats from your headphones into your ears and straight to your heart.

SM Entertainment is bringing in the final step of the Christmas spirit with a new song from its newest boy group EXO. Ahead of EXO's winter album release on Dec. 10, EXO has revealed a music video teaser for title track "Sing For You." Fans can check out the new moody black and white teaser below.

SM Entertainment released the following description for EXO's winter album title track "Sing For You."

"'Sing For You' is described to have an acoustic guitar sound that fits well with members' voices. It's a pop ballad track about confessing to the person you're in love with but nervous about," reads the SM Entertainment statement.

EXO will also release another title track called "Unfair," which is described as having a "trendy and bright melody" and "is a medium tempo pop track."

Allkpop reports that EXO's "Sing For You" winter album will include three other tracks entitled "Girl x Friend," "On the Snow," and the group's "Star Wars: The Force Awakens" promotional single, "Lightsaber."

EXO will begin official promotions for "Sing For You" with a performance on "Show! Music Core" on Dec. 12. They will follow this up with an appearance on "Inkigayo." Finally, EXO will host an event entitled "EXO Comeback Stage - Sing For You" through Naver's "V" app.