Fans of the hit ABC medical drama series are still depressed that actress Sandra Oh will officially leave the series after the current Season is over, and she recently posted a message on social media indicating that she was filming her final scenes as Dr. Cristina Yang this week.

"I've been dreaming nonstop about Grey's for the past few weeks," wrote Oh via Twitter on April 21. "Can't believe it's my last week here already."

She also wrote on Twitter that she shot her final scene with her co-star Justin Chambers. Chambers has played the role of Dr. Alex Karev since the show debut in 2005.

"Slowly wrapping out my trailer," wrote the 42-year old actress along with a photo displaying her trailer.

In the new "Change of Heart" episode airing tonight, Dr. Yang has to choose whether or not a young patient will receive a heart transplant from the child's sibling after the parents are unable to make the difficult decision.

According to a new report released yesterday, the Season 10 finale titled "Fear (of the Unknown)" might have a tragic ending when Oh bids the series and her memorable character farewell.

"There will be a catastrophe in the finale - a possible terrorist incident in Seattle sends a flood of casualties to Grey Sloan Memorial - but it mostly serves as a backdrop to the episode's main event: Cristina's emotional [and non-deadly] exit," according to a TV Line report by Michael Ausiello.

Oh revealed in a previous interview about leaving the series after this season's last episode.

"It's been a great privilege to play the character of Cristina Yang on GA and I am both sad and excited to see where this, her final season will take her," said Oh to Eonline in August 2013.

"Grey's Anatomy" Season 10 airs on May 15, 2014 on the ABC network.

Here is a sneak peek video on Grey's Anatomy Episode 21:

Here is another video on the episode: