Analysis of information sources in references of the Wikipedia article "성주간" in Korean language version.
Great Week (or Holy Week) is the most important part of the liturgical year for the Eastern Churches. It belongs to the moveable liturgical cycle and follows the Holy and Great Lenten period, beginning with Palm Sunday and ending on Great Saturday evening before the Divine Liturgy of the Resurrection (Pascha).
Holy Week. The last week in LENT. It begins on PALM SUNDAY; the fourth day is called SPY WEDNESDAY; the fifth is MAUNDY THURSDAY or HOLY THURSDAY; the sixth is GOOD FRIDAY; and the last 'Holy Saturday', or the 'Great Sabbath'.
The last seven days of this period constitute Holy Week. The first day of Holy Week is Palm Sunday, the fourth day is Spy Wednesday, the fifth Maundy Thursday or Holy Thursday, the sixth Good Friday or Holy Friday, and the last Holy Saturday or the Great Sabbath in Eastern Rite traditions.
Many Christians are already familiar with the ancient, and now recently restored, liturgies of the Three Days: Maundy Thursday, Good Friday, and the great Easter Vigil service of light, readings, baptism, and communion. The worship resources published by the Evangelical Lutheran Church in America, the Episcopal Church, the United Methodist Church, the Presbyterian Church U.S.A. and the Catholic Church include nearly identical versions of these liturgies.