Question: Not Alone, is Zhang Liyin's which number overall single, Zhang held a showcase to support the release of the single, which was held at the Century Theater in Beijing, EXO members Tao and Chen were guests, Exois a South Korean-Chinese boy group based in Seoul?
{'answer': 'fourth', 'supporting_facts': [['Not Alone (Zhang Liyin song)', 0], ['Exo (band)', 0]]}